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Background. Rubia cordifolia has been used to treat various diseases and exhibits antimicrobial, anti-inflammatory, analgesic and antidiarrheal activities. The plant has not been investigated for its anti-mycobacterial activity against virulent tuberculosis strains as well as cytotoxic and anti-oxidant activities in mononuclear cells and neutrophils. Methods. Ethanolic and dichloromethane leaf extract fractions of Rubia cordifolia (0.2- 125μg/ml) were screened for anti-mycobacterial activity using a fluorescent microplate assay. The anti-oxidant activity of the fractions was tested using the radical scavenging assay, while their cytotoxicity to lymphocytes was measured using the WST-8 assay. Reactive oxygen species production by neutrophils exposed to fractions was tested using Cell Meter™ Fluorimetric ROS Assay kit. Results. The ethanolic leaf fractions exhibited overall superior anti-mycobacterial activity than the dichloromethane group and were further screened for anti-oxidant and cytotoxic activities. Ethanolic sub-fractions K2F-3.2, K2F-3.3 and K2F-3.4 showed significant antioxidant activities at concentration of 50 μg/ml to 200 μg/ml and higher in both the cell free-based radical scavenging activity and total reactive oxygen species production assays. For lymphocytes, the test agents showed anti-proliferative activity at 25 μg/ml to 200 μg/ml for sub-fraction K2F-3.3B and 50 μg/ml to 200 μg/ml for agents K2F-3.2 and K2F-3.4. Conclusion. The current study is the first to record the in vitro anti-mycobacterial, anti-oxidant and cytotoxic activities of Rubia cordifolia plant leaf extract sub-fractions using the given experimental setups and further research activities to identify the bioactive components are to be pursued.

african journal of traditional complementary and alternative medicines

EVALUATION OF THE ANTI-MYCOBACTERIAL, ANTI-OXIDATIVE AND ANTI-PROLIFERATIVE ACTIVITIES OF RUBIA CORDIFOLIA ETHANOLIC LEAF EXTRACT SUB-FRACTIONS IN HUMAN LYMPHOCYTES AND NEUTROPHILS